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LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
BricsCAD - A powerful CAD platform, with features familiar to you from native .dwg applications.
FreeCAD - An open-source parametric 3D modeler
nanoCAD - nanoCAD is a pro-grade 2D CAD system with native DWG support and full customizability.
SketchUp - 3D for Everyone
NttCAD - Free 2D/3D CAD software, easy to use and multi-platform